Publication: Particle segregation process in debris flow by using smooth particle hydrodynamic and particle image velocimetry
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Date
2023-07-01
Authors
Muhammad Khairi Bin A.Wahab
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Abstract
Debris flows are a significant hazard that can cause widespread destruction and loss of life. Recent research has indicated an increase in the frequency and magnitude of debris flow occurrences, attributed to both climate change and human activity. Current methods for assessing debris flows rely solely on post-event analysis, highlighting the need for new approaches to understanding and mitigating these events. To address this need, this study conducted a physical flume tests and numerical simulations to investigate the influence of changing flume inclination and water level on the impact of particle segregation in debris flows. Our results demonstrate that inclination and water level have a significant influence on the shape of particle distribution. A Smoothed Particle Hydrodynamics (SPH) numerical model using the DualSPHysics code package also applied to simulate 12 cases of debris flow. PIV test results were used to validate the velocity of particle distribution with numerical results, and we found a reasonable agreement between the two methods, with a percentage difference of less than 15%. Additionally, the deposition patterns of the physical and numerical models were compared and found favourable results, with a planar area difference of only 2.98% for case 2, 9.83% for case 8, and 7.51% for case 9. Our findings suggest that SPH is a useful tool for analysing, mitigating, and predicting debris flow events, which could reduce costs and work hours associated with constructing physical models of debris flow and promote non-structural techniques for mitigating debris flow-related harm. Overall, this study highlights the potential of SPH modelling as a cost-effective and efficient approach to understanding the complex dynamics of debris flows and supporting disaster risk reduction efforts